在桂北、滇东及黔西南一带,石炭系一二迭系的岩层系连续沉积,未见通常所称的栖霞底部煤系或梁山组。从上石炭统至下二迭统,是一套以灰岩为主的碳酸盐类岩层,这是我国地层工作者研究石炭系与二迭系界线的理想地区。近年来,我队张明发、龙家荣等在广西隆林县城附近,测制石炭系—二迭系剖面时,采集了大量化石,其中(竹蜓)化石交由笔者研究。在栖霞组下部3米厚的灰色厚层灰岩中,找到了以Misellina为主的(竹蜓)类动物群, In the areas of northern Guangxi, eastern Yunnan and southwestern Guizhou, the sedimentary formations of the Carboniferous-Permian series have been continuously deposited. There is no commonly known Qixia coal measure or Liangshan formation. From Upper Carboniferous to Lower Permian, it is a limestone-based carbonate rock formation. This is an ideal area for our stratum workers to study the boundary between Carboniferous and Permian. In recent years, Zhang Mingfa and Long Jiarong of our team collected a large number of fossils in the Carboniferous-Permian Section in the vicinity of Longlin County, Guangxi Province, and the fossils of (bamboo-dragonfly) were studied by the author. In the thick, thick limestone 3 meters below the Qixia Formation, the Misellina-dominated (bamboo-dragonfly) fauna was found,